Both are the decent colleges but as per the analyzing report of Careers360 Uiet Kurukshetra has AAAA rating which means very good. The rating is based on the research of the collegescement, Faculty & Industry Exposure etc. You can check the placement of the colleges with the given below links.

http://bmiet.net/placements/our-recruiters/

http://www.uiet.puchd.ac.in/images/PDFfiles/Placement%20Brochure%202017-18.pdf

You can check the genuine reviews of the colleges with the given below links.

https://engineering.careers360.com/colleges/bm-institute-of-engineering-and-technology-sonepat

https://engineering.careers360.com/colleges/university-institute-of-engineering-and-technology-kurukshetra-university-kurukshetra

Good Luck!